iio:adc:ti-adc108s102: Drop CONFIG_OF and of_match_ptr protections
I'm trying to clean this (now) anti-pattern out of IIO to avoid
cut and paste into new drivers.
Also add an include of mod_devicetable.h as the driver directly uses
struct of_device_id which is defined in there.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Jan Kiszka <jan.kiszka@siemens.com>